node/test/pummel/test-fs-largefile.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.




var common = require('../common');
var assert = require('assert');
var path = require('path'),
    fs = require('fs'),
    filepath = path.join(common.tmpDir, 'large.txt'),
    fd = fs.openSync(filepath, 'w+'),
    offset = 5 * 1024 * 1024 * 1024, // 5GB
    message = 'Large File';

fs.truncateSync(fd, offset);
assert.equal(fs.statSync(filepath).size, offset);
var writeBuf = new Buffer(message);
fs.writeSync(fd, writeBuf, 0, writeBuf.length, offset);
var readBuf = new Buffer(writeBuf.length);
fs.readSync(fd, readBuf, 0, readBuf.length, offset);
assert.equal(readBuf.toString(), message);
fs.readSync(fd, readBuf, 0, 1, 0);
assert.equal(readBuf[0], 0);

var exceptionRaised = false;
try {
  fs.writeSync(fd, writeBuf, 0, writeBuf.length, 42.000001);
} catch (err) {
  console.log(err);
  exceptionRaised = true;
  assert.equal(err.message, 'Not an integer');
}
assert.ok(exceptionRaised);
fs.close(fd);

process.on('exit', function() {
  fs.unlinkSync(filepath);
});